placementIn method
Where the letters go in box, with the style and width they're laid out at (infinite for left-aligned
auto-width lines) and the first baseline's depth, so other text laid out with it lies exactly over them.
Implementation
({Offset origin, TextStyle style, double width, double baseline}) placementIn(Size box) {
final _Typeset typeset = _currentTypeset();
final Offset origin = typeset.origin(box, _verticalTrim, _textLayout);
return (
origin: origin,
style: typeset.textStyle,
width: typeset._layoutWidth!,
baseline: origin.dy + typeset._firstBaseline,
);
}